Valve reseating tool



30 guide.

Patented Feb. 2, 19.32A

UNITED STATES PATENT ortica ROY STOUGAARD, OF DETROIT, MICHIGAN, ASSIGORTO PACKARD MOTOR CAR COM- u PANY, OF DETROIT, MICHIGAN, A CORPORATION OFMICHIGAN VALVE RESEATING TOOL Application filed yl'eeember 16, 1927.Serial No. 240,359.

y f rlihis invention relates to devices for Vgrindingvalve seats. l

In the manufacture of cylinder blocks ther cylinders together with theirrespective valve vip0rtsgare cast in block. Guide holes are drilled andreamed normalto the topv face of thelolock and guides are then pressedin and accurately reamed for the reception ofv valve stems.'y A cuttingtool is mounted for rotation on amandrel which snuglyhts the valvestemguide to cut the valve seat con.

centric andnormal tothe'valve stem guide, thus when the valve isinstalled it fits the seat perfectly. The cylinder block and valve Stemguide are castironvvhich is subjected to seasoning `when heated, andduring the seasoning the texture ofthe metal changes. This sometimescauses the valvey seats to warp but more often the valvek stern yguidewill warp zei and `change its'position slightly, so that itis no longerin proper alinement with the valve seat. In order to rcorrect theseevils, the valve should be reseated by lmaking the seat concentric andnormal 'to the new position of the guide, and

'3 it is the aiml of the present invention to provide a device for thispurpose.

An object of the invention is to provide a device for cutting valveseats concentric and Anormal to the axis of the valve stem Anotherobject of the invention is to pro.- 4vide a device for cutting valveseats which can vbe easily and quickly adjusted and will efficientlyperform its intended function.

Another object of the invention is to provide a device for cutting and.finishing a valve seatvvhichy can be quickly centered in a valve stem'kguide and so supported for operation that it will maintain itsalinement.

Still a further object of the invention is to provide a 'device forcutting valve seatswhich has the advantage of a positive action incutting valve seats concentric and normal to the valve stem guides, adevice which is highly '455 eiiiecient in operation, yet of markedsimplicity as a' whole and in respect to each of its component parts, sothat its manufacture .is economically facilitated both as regards toparts and their assembly.

Other objects of the invention will appear invention invan operative'position on a cylin- 55 der block of an interna-l combustion engine, aportion of thecylindcr block heilig broken away. f

F ig. 2 is a view taken substantially on line 2 2 of F ig. 1 With partsinscction, and

Fig. 3 is a view taken substantially on line 3 3 of Fig. 2, the cylinderblock being omitted.

f Referring by numerals to the drawings, 10 represents the cylinderblock of an internal combustion engine having a plurality of cylinders11 together with inlet ports 12 a nd exhaust ports 13. The ports areprovided with the usual valve seat 1.11 and have positioned thereinvalve stem guides r15. The cylinder block has threaded into its upper:face a number of studs-16 for securing in position a cylinder head, notshown. f

A tapered mandrel 17 having a cylindrical head 18 is fitted into theguide 15 aud made secure by any suitable means, such as by a nut, notshown, threaded upon the lower end of the mandrel. A split sleeve orbushing 19 is lit-ted upon the head of the mandrel and secured in placeby a lock nut 20. This sleeve provides a bearing for a cutting orfinishing tool 21. As shown, the tool is a rose cutter of the usual typehaving its teeth ground to the proper angle to cut the valve seat faceas indicated at 14. The cutting tool is centrally bored as indicated at22 and is mounted to rotate freely on the bushing 19 and is provided inits upper face with recesses or sockets 23, the object of which willhereinafter appear.v

Positioned upon the face of the cylinder block is a support having ahase 24 provided With a slot 25 for the reception. of the stud bolts :16in the upper face of the cylinder block. As shown, the base issubstantially semi-circular and is provided with an arm 2G inclined fromthe perpendicular and bifurcated vat the'base, as indicated at 27, topermit theinsertion of a ywrench 28. The wrench has a handle 29 for themanipulation thereof and an enlarged portion 30 internally threadticallydisposed bore .32.

ed to receivethe threads on the stud bolts 16 by means of which the baseis clamped in position. The upper or free end of the arm 26 is providedwith a boss 31 having a ver- Mount'edfto reciprocate fandto2- r'ota'tein the bore 32 is a hollow shaft 33 having@ handle 31 forrthemanipulation thereof, a coupling "and" an 'adjustable sleevaor collar36, the"'coll'arbeing adaptdto bear upon the upper face of the boss 31to limit the downward movement of the "shaft, the

obj ect of which willv hereinafter appear. The coupling 35 has a centralbore 37 vand a vcounter bore .33 '-forr'nedfto' provide aw socket forthe reception off a 'head 39, the yconnec-u tion beingzin fthe'natureofa universal joint,`

and afpin 40 `is provided-t0'preventrfotary movement between the parts.The'heady -39 is adapted to bear upon thefupp'erface of the -f cuttingtfool 21 and "is providedwith arecess i tions in'fthe alin'ement of theshaftwith t 4:1 forv the reception of the head of the man.

drel and pins Y 42 yso vpositioned in -fits'flower edge to engage therecesses 23 in the fto'ol 'and thereby interlocking/the head-with thetool.

noperation the mandrel 17 isfcentered-inl the valve stem guide 15 andmade secure;

Thecu'tter 21 -is`then placed juponthe'bush-V cutter 'is tted to rotateksmoothly and is adapted -to bedriven by the shaft33'wvhih is supportedin a vertical bore in y'the boss =31 on 'thevfree end of the arm '26.lThe arm 'Q6 and its "associated parts V`w'v'illftalre any stress.

exerted on the shaft 33by'reaso1rof carelessness on the part ofanechan1c,-so:that'such stresses will ntotfbe Vcommunicated ltoreitherthe'mandr'el or-theicltting tool.r The 'armf'QG Y is integral with the-base`24 andthe base-ismade adjustable oni' the` upperfaceoffthe.

cylinder block, so that the shaftimay'be supported 'substantially inalinem'ent*withV the cutting` tool. C norder to rectify' 'any' variai1@cutting tool, due' to `adjustment f of" thefarm on Ythe cylinder? blockorto the changed position f the valvel guide, the head? 39 carried Y bythe shaft 33 and engaging the cuttingtool f has afuniversalconnectionwiththe shaft which pjerniits'the cutting tfo'olto maintain aposition normal to t'he a'xis'ofV the mandrel without strainl on themandrel. rEhe `shaft is rotated byV handi and Vis provided witlranadjustable collar, adapted to be locked `in `posi-v i tionby-athumbscrew to limit the downward movement of the 'sha-ft. TAs the collar'engages the upper face ofthe boss'31lthe downf wardmovement ofthe shaftisl stopped and prisin'g aman'drel'adaptd to be'p'ositioned in va valve,stemr guide, a cutting tool rotatably mounted on'the mandrel, a headhaving an l interloc/ling connectionwlth the cutting tool,

a shaft having a handle for the rotation thereof, a'fleXiblecoupling-betweenfthegh'ft and the head, an arm support-ing'fthelshaft,.

a base `forsaid` arm, and means for'-adji'i'stingVand"securingfthe'samein a fixedposition;` y

v 2. A device'forjcutting valve seats compris-r ing a base, an Yarm-supportedftherebygiashaft supported bythe arm,`V a m-'andrelfadapted'to b'esuppojrted in` a valvestem guidata-sleeve,

locked upon the? mandrel; a. cutting 'tool mounted' yfor rotation onitheasleev'e, a headV pivotally AVc'onnected'- tothei shaft and; anfineterlocking A'connection' 'between the* head'and the'cutting tool. Y Y YA device forfcuttingvalveseats comp'risingv an ladjustable base, an arm'support--l edby "the ibaseya boss on the freeendof-the armhaving a:perpendicular bore, ashaffty mounted 'for'rotation land reciproeation inlthe bore',= anfu'stablefstop on the shaft,V aman-A drel- 'adapted tofbel'supported in:- a val-ve Tstemi guide, abearingfsleeve locke'duponthe`-1nandreh a cutting tool" mountedffor rotation f on the bearing);sleeve, a head flexibly connected to thev shaftVVV and an interlockinglconnection between the'y head and lthe cuttingtool.

4, A device'for cutting'valve/s'eats comprising a 'mandrelr-adap'tedto'be supported in av valve stem guide,=a bearing sleeve locked upon themandrel, al cutting toolfmount'ed for rotation on vthe bearing sleeve, ashaft supported for rotation in' the bearing? sleeve, a head looselyconnected to the sha-ft foruniversal movement in'afho-rizontalyplanehaving a lockingconnectionfwith the cuttingtool and an armsupporting VVtheqshaft in alinement with thejcuttingtooL g Y f 1In'testimony whereof InaHiX my. signature. ROY A. STOUGAARD.

the l'cutting tool will cease to function. rIt-is Y by this means thatthedepth ofthe eut may be iregulated or adju-stedperfectly.

" While I `have herein described in some detaill a specific embodimentYof :my invention, 1 which Ideemftobe.' new adfadvantageous

